﻿//////////////////////////////////////////////////////////////////////////////
//
// Copyright © 1998-2024 Glodon Company Limited.
//
// Licensed under the MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the “Software”),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//////////////////////////////////////////////////////////////////////////////
#pragma once

#include "GcmpGUiBaseImpl.h"
#include "OwnerPtr.h"
#include "GbmpDefines.h"

namespace gcmp
{
    template <typename Handler, typename Args>
    class ControlHandler
    {
    public:
        ControlHandler()
            : m_needBlock(false)
            , m_handler(nullptr){}

        ControlHandler(OwnerPtr<Handler>  pHandler)
        : m_needBlock(false)
        , m_handler(TransferOwnership(pHandler)){}
        
         void Process(Args* pArgs)
        {
            if (false == m_needBlock && m_handler)
            {
                m_handler->On(pArgs);
            }
        }

        void SetControlHandler(OwnerPtr<Handler>  pHandler)
        {
            m_handler = TransferOwnership(pHandler);
        }

        bool BlockControlHandler(bool needBlock) 
        {
            bool wasBlocked = m_needBlock;
            m_needBlock = needBlock;
            return wasBlocked;
        }
        
        Handler* operator->()
        {
            return m_handler.get();
        }

        const Handler* operator->() const
        {
            return m_handler.get();
        }

#ifdef __clang__
        explicit operator bool() const
#else
        operator bool() const
#endif
        {
            return static_cast<bool>(m_handler != nullptr);
        }
        
    private:
        OwnerPtr<Handler> m_handler;
        bool m_needBlock;
    };
}
